Final answer:
In The Polar Express, hot chocolate is the liquid refreshment dispensed to the children on their trip to the North Pole.
Step-by-step explanation:
In The Polar Express, the type of liquid refreshments dispensed to the children during their trip is hot chocolate, which is famously served by the train's singing waitstaff in a lively musical number. The hot chocolate scene is one of the most memorable from the book and its movie adaptation, highlighting the magical and festive atmosphere of the journey to the North Pole.